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I'm not sure if this is true or not but I remember reading that the angle of the shoulder has a lot to do with the efficiency of the power burn. I think this is why the short mags can do so much with less powder. I am by not means an expert so if I'm wrong please let me know.
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USAF Retired 
Far better is it to dare mighty things, to win glorius triumphs, even though checkered by failure... than to rank with those poor spirits who neither enjoy nor suffer much, because they live in a gray twilight that knows not victory nor defeat.
Theodore Roosevelt
Don't sweat the petty things and don't pet the sweaty things
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